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IFM Electronic
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LR2759
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IFM Electronic LR2759 Operating Instructions Manual

Operating instructions
Electronic level sensor
LR2759
UK
80257883 / 01 02 / 2018
Contents
1 Preliminary note ................................................................................................... 5
2 Safety instructions ...............................................................................................5
3 Items supplied......................................................................................................6
4 Getting started .....................................................................................................6
5 Functions and features ........................................................................................6
5.1.1 Restriction of the application area ........................................................7
6 Function ............................................................................................................... 8
6.3.1 Display functions ..................................................................................9
6.3.2 Analogue function ................................................................................9
6.3.3 Switching functions ............................................................................. 11
6.3.4 Damping function ................................................................................12
6.3.5 Probes for different tank heights ......................................................... 12
6.3.6 Defined state in case of a fault ...........................................................12
6.3.7 IO-Link ................................................................................................13
6.3.8 Simulation functions ...........................................................................13
7 Installation..........................................................................................................13
7.1 Installation location / environment ...............................................................13
7.1.1 Minimum distances and connection piece diameter .......................... 13
7.1.2 Installation in pipes .............................................................................14
7.1.3 Applications with viscous and fast flowing media ...............................15
7.1.4 Fill openings .......................................................................................15
7.1.5 Heavy soiling ......................................................................................16
7.1.6 Heavy foam build-up and turbulence .................................................. 16
7.1.7 Notes on tank adjustment ................................................................... 17
7.2 Probe installation .........................................................................................18
7.2.1 Attaching the probe .............................................................................18
7.3 Probe length ................................................................................................19
7.3.1 Shorten the probe .............................................................................. 19
2
7.3.2 Determine probe length ......................................................................20
7.4 Installation of the unit in the tank .................................................................20
7.4.1 Installation in open metal tanks ..........................................................21
7.4.2 Installation in plastic tanks .................................................................. 22
7.4.3 Note on the use according to EHEDG ................................................ 23
7.4.4 Notes on the use according to 3-A .....................................................23
8 Electrical connection .......................................................................................... 24
9 Operating and display elements ........................................................................25
10 Menu ................................................................................................................ 26
10.1 Menu structure ........................................................................................... 26
10.2 Explanation of the menu ............................................................................ 28
10.2.1 Main menu ........................................................................................ 28
10.2.2 Level EF (extended functions) .......................................................... 28
10.2.3 Level CFG (configuration) ................................................................29
10.2.4 EN level (environment) .....................................................................29
10.2.5 Level SIM (simulation) ......................................................................29
11 Parameter setting .............................................................................................30
11.1 Parameter setting in general ......................................................................30
11.2 Basic settings (set-up) ...............................................................................32
11.2.1 Enter probe length ............................................................................32
UK
11.2.2 Carry out tank adjustment .................................................................32
11.3 Configure display (optional) .......................................................................33
11.4 Set output signals ......................................................................................33
11.4.1 Set output function for OUT 1 ...........................................................33
11.4.2 Set switching limits (hysteresis function) .......................................... 33
11.4.3 Set switching limits (window function) ..............................................34
11.4.4 Set switch-on delay for switching outputs ......................................... 34
11.4.5 Set switch-off delay for switching outputs ......................................... 34
11.4.6 Set output function for OUT2 ............................................................ 34
11.4.7 Scale analogue signal .......................................................................35
11.4.8 Set output logic for switching outputs ............................................... 35
11.4.9 Set response of the outputs in case of a fault ................................... 35
11.4.10 Set damping for the measured signal ............................................. 35
11.4.11 Set delay time in case of a fault ......................................................35
11.5 Reset all parameters to factory setting ......................................................35
11.6 Change basic settings ................................................................................36
3
11.6.1 Re-enter probe length .......................................................................36
11.6.2 Set to another medium .....................................................................36
11.7 Simulation ..................................................................................................36
11.7.1 Set simulation value .......................................................................... 36
11.7.2 Set simulation duration .....................................................................37
11.7.3 Switch simulation on / off ..................................................................37
12 Operation ......................................................................................................... 37
12.1 Operation with single probe ....................................................................... 37
12.2 Operation with a bypass or still pipe ......................................................... 38
12.3 Function check ..........................................................................................38
12.4 Operation indication ...................................................................................38
12.5 Read the set parameters ...........................................................................39
12.6 Change between length display and percentage ......................................39
12.7 Error indications .........................................................................................39
12.8 Output response in different operating states ............................................ 40
13 Technical data .................................................................................................. 41
14 Maintenance / Transport .................................................................................. 42
14.1 Cleaning and maintenance when used in 3-A applications .......................42
14.2 Transport ...................................................................................................43
15 Factory setting .................................................................................................44
16 Notes on parameter setting via IO-Link ...........................................................44
16.1 Application example ...................................................................................45
16.2 Unit locking / data storage (as from IO-Link V1.1) .....................................46
4

1 Preliminary note

1.1 Symbols used

► Instructions > Reaction, result […] Designation of keys, buttons or indications → Cross-reference
Important note Non-compliance may result in malfunction or interference.
Information Supplementary note.

2 Safety instructions

UK
• Read this document before setting up the product and keep it during the entire service life.
• The product must be suitable for the corresponding applications and environmental conditions without any restrictions.
• Only use the product for its intended purpose (→ Functions and features).
• Only use the product for permissible media (→ Technical data sheet).
• If the operating instructions or the technical data are not adhered to, personal injury and/or damage to property may occur.
• The manufacturer assumes no liability or warranty for any consequences caused by tampering with the product or incorrect use by the operator.
• Installation, electrical connection, set-up, operation and maintenance of the product must be carried out by qualified personnel authorised by the machine operator.
• Protect units and cables against damage.
5

3 Items supplied

• 1 LR2759 level sensor
• 1 operating instructions
In addition, the following is necessary for installation and operation:
• 1 probe (→ Accessories)
• Mounting material (if necessary, a launching plate (→ 12.1), → Accessories)
► In the event of incomplete or damaged items supplied please contact ifm
electronic.
► Only use accessories from ifm electronic. Accessories: www.ifm.com The optimum function is not ensured when using components from other
manufacturers.

4 Getting started

For the most frequent applications the quick set-up described below is possible. The quick set-up does not replace observance of the other chapters.
► Install the unit correctly:
Installation distances (→ 7.1), Electrical connection (→ 8).
► Set probe length (→ 11.2).
> The unit is ready for operation.
Without changes = factory settings active (→ 15). Change of the factory settings (→ 11).
► Optional: Carry out tank adjustment (→ 11.2.2). ► If necessary, make more settings for adaptation to the application
(→ 11.3) and (→ 11.4).
► Check whether the unit operates correctly.

5 Functions and features

The unit continuously detects the level in tanks.
6

5.1 Applications

• Food and hygienic areas.
• Applications with increased requirements for protection rating and resistance
(→ Technical data sheet).
The unit complies with the standard EN 61000-6-4 and is a class A product. The unit may cause radio interference in domestic areas. If interference occurs, the user must take appropriate actions.
UK
The microwave energy radiated by the unit is much below that of mobile phones. According to the current state of science the operation of the unit can be classified to be harmless to human health.

5.1.1 Restriction of the application area

Incorrect measurements may be caused by the following media:
- Highly absorbing surfaces (e.g. foam).
- Intensely bubbling surfaces.
- Media which are very inhomogeneous, separate from each other thus forming separation layers (e.g. oil layer on water).
► Check the function by performing an application test.
► Installation in a steady area (→ 7.1).
> In case of signal loss, the unit displays [SEnS] and switches the
outputs to a defined state (→ 12.8).
• The unit is not suitable for bulk materials (e.g. plastic granulates) and media with a very low dielectric constant, e.g. oils.
• The unit is not suitable for applications where the probe is subjected to permanent and high mechanical stress (e.g. fast moving viscous media or fast flowing media).
• Use preferably in metal tanks. When used in plastic tanks, deterioration caused by electromagnetic interference may occur (noise immunity to EN61000-6-2). Refer to: (→ 7.4.2).
7

6 Function

6.1 Measuring principle

Fig. 6-1 Fig. 6-2
D
The unit operates on the principle of guided wave radar. It measures the level using electromagnetic pulses in the nanosecond range.
The pulses are transmitted by the sensor head and guided along the probe (Fig. 6-1). When they hit the medium to be detected they are reflected and guided back to the sensor (Fig. 6-2). The time between transmitting and receiving the pulse directly relates to the travelled distance (D) and the current level. The reference for distance measurement is the lower edge of the process connection.

6.2 Outputs

The unit generates output signals according to the parameter setting. 2 outputs are available. They can be set separately.
OUT1 switching signal for level limit / IO-Link (→ 6.3.7) OUT2 • analogue signal proportional to the level 4...20 mA / 20...4 mA
or
8
• switching signal for level limit

6.3 Other features of the unit

• Hygienic approvals / conformities (→ Technical data sheet)
• For CIP / SIP applications (→ Technical data sheet)
• Special operating mode for media with increased foam build-up (→ 11.6.2
• Tank adjustment enables suppression of undesired interference (e.g. caused by structures in the tank or when mounted in a connection piece (→ 11.2.2))
UK
• Display of the level and the switching status via display / LEDs
• IO-Link function (→ 6.3.7)

6.3.1 Display functions

The unit displays the current level, either in mm or in percent of the scaled measuring range. Factory setting: mm. The display unit is defined by programming (→ 11.3). In the operating mode, the user can switch between mm and percentage (→ 12.6).
The set unit of measurement and the switching status of the outputs are indicated by LEDs (→ 9).

6.3.2 Analogue function

The unit provides an analogue signal proportional to level. The analogue output (OUT2) can be set ((→ 11.4.6) and the following illustrations).
• [ou2] defines the output function of the analogue output: current output rising [ou2] = [I] or current output falling [ou2] = [InEG].
• The analogue start point [ASP2] defines at which measured value the analogue start value*) is provided (→ 11.4.7).
• The analogue end point [AEP2] defines at which measured value the analogue end value*) is provided (→ 11.4.7).
*) The analogue start value is 4 mA with [ou2] = [I] or 20 mA with [ou2] = [InEG].
The analogue end value is 20 mA with [ou2] = [I] or 4 mA with [ou2] = [InEG].
Minimum distance between [ASP2] and [AEP2] = 20 % of the active zone.
9
Curve of the analogue signal (factory setting):
I [mA]
ASP2 AEP2
I [mA]
20
4
L
I2 I1
A
Curve of the analogue signal (measuring range scaled):
20
4
L
A
L: level A: active zone = L - (I1 + I2)
I1: inactive zone 1 ASP2: analogue start point I2: inactive zone 2 (→ Technical data sheet) AEP2: analogue end point
①: ②:
[ou2] = I (factory setting) [ou2] = [InEG]
I1 I2
Additional information about the analogue output: (→ 12.8) Note the tolerances and accuracies during the evaluation of the analogue signal
(→ Technical data sheet).
10

6.3.3 Switching functions

Via switching output OUT1 (factory setting) or additionally via OUT2 (can be set) the unit signals that a set limit level has been reached or that the level is below the limit. The following switching functions can be selected:
• Hysteresis function / normally open (Fig. 6-3): [oux] = [Hno]
• Hysteresis function / normally closed (Fig. 6-3): [oux] = [Hnc]
First the set point (SPx) is set, then the reset point (rPx) with the requested difference.
• Window function / normally open (Fig. 6-4): [oux] = [Fno]
• Window function / normally closed (Fig. 6-4): [oux] = [Fnc]
The width of the window can be set by means of the difference between [FHx] and [FLx]. [FHx] = upper value, [FLx] = lower value.
Fig. 6-3 Fig. 6-4
FE
L
SP
rP
FH
FL
UK
t
L : HY: FE:
1 0
1 0
level hysteresis window
Fno
Fnc
• The adjustable limits (e.g. [SP1] / [rP1]) always refer to the lower edge of the probe.
• For the switching output a switch-on and switch-off delay of max. 60 s can be set (e.g. for especially long pump cycles) (→ 11.4.4).
11

6.3.4 Damping function

With unsteady level (e.g. turbulence, wave movements) display and output response can be damped. During damping the determined level values are "smoothed" by means of a mean filter; the result is a steady curve. Damping can be set by means of the parameter [dAP] (→ 11.4.10). [dAP] indicates in seconds after what time 63 % of the final value is reached in the event of a sudden jump. After 5 x [dAP] almost 100 % has been reached.

6.3.5 Probes for different tank heights

The unit can be installed in tanks of different sizes. Probes in different lengths are available. To adapt to the tank height, each probe can be shortened. The minimum probe length is 150 mm, the maximum probe length 2000 mm.

6.3.6 Defined state in case of a fault

• In case of a fault a state can be defined for each output.
• If a fault is detected or if the signal quality is below a minimum value, the outputs pass into a defined state. Applies to the analogue output according to Namur recommendation (NE43). For this case the response of the outputs can be set via the parameters [FOU1], [FOU2] (→ 11.4.9).
• Temporary loss of signal caused e.g. by turbulence or foam build-up can be suppressed by a delay time (parameter [dFo] → 11.4.11). During the delay time the last measured value is frozen. If the measured signal is received again in sufficient strength within the delay time, the unit continues to work in normal operation. If, however, it is not received again in sufficient strength within the delay time, the outputs pass into the defined state.
In case of heavy foam build-up and turbulence, note the examples of how to create a steady area (→ 7.1.6)
12

6.3.7 IO-Link

This unit has an IO-Link communication interface which requires an IO-Link capable module (IO-Link master) for operation.
The IO-Link interface enables direct access to the process and diagnostic data and provides the possibility to set the parameters of the unit during operation.
In addition, communication is possible via a point-to-point connection with a USB adapter cable.
UK
The IODDs necessary for the configuration of the unit, detailed information about process data structure, diagnostic information, parameter addresses and the necessary information about required IO-Link hardware and software can be found at www.ifm.com.

6.3.8 Simulation functions

Various levels and errors can be simulated for set-up, maintenance or interference reduction. The duration of the simulation can be selected (1 min...1 h). The simulation can be started manually and runs until it is stopped manually or the set time elapses. During the simulation the outputs respond according to the simulated process values (→ 11.7).

7 Installation

7.1 Installation location / environment

• Vertical installation from the top is preferred.
► Observe the notes on tank adjustment (→ 7.1.7)
• Installation preferably in closed, metal tanks or bypass pipes.
• For installation in open tanks (→ 7.4.1)
• For installation in plastic tanks (→ 7.4.2).

7.1.1 Minimum distances and connection piece diameter

► Select a connection piece height that is smaller than the connection piece
diameter.
13
B
Fig. 7-1 Fig. 7-2
without adjustment
D
A2A3
A1
Installation distances with adjustment (→
7.1.7) A1: 10 mm A1: 10 mm
A2: 20 mm A2: 50 mm A3: 20 mm to structures in the tank (B)
50 mm to other sensors type LR
D:
ø 30 mm if installed in a connection
piece
Installation distances without adjustment
A3: 50 mm to structures in the tank (B)
50 mm to other sensors type LR
D: No connection piece allowed
according to Fig. 7-2

7.1.2 Installation in pipes

► Installation only if hygienic requirements are met. ► Only install the unit in metal pipes. ► The internal pipe diameter d must at least have the following value:
With adjustment(→ 7.1.7) Without adjustment
ø 100 mm with [MEdI] = [HIGH]
d
14
ø 30 mm
ø 250 mm with [MEdI] = [MId] (→
11.6.2)

7.1.3 Applications with viscous and fast flowing media

For applications with viscous or flowing media and / or agitators in which the probe is exposed to lateral load:
► Probe must not be in contact with tank
wall / structures.
► Increase lateral minimum distances
according to the probe length and the lateral deflection to be expected.
► If possible, fix the probe at the
tank bottom so that it is electrically conductive. This can be done by means of a sleeve or similar devices (Fig. 7-3).
► Check the correct function (in particular
with empty tank).
Fig. 7-3
UK

7.1.4 Fill openings

Do not install the unit in the immediate vicinity of a fill opening (Fig. 7-4).
Fig. 7-4
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